It was narrated from Muhammad bin Hatibthat the Messenger of Allah said:
"What differentiates between the lawful and the unlawful is (beating) the Daff and raising the voices (in song) at the time of marriage." (DE)
English reference (DE): Vol. 3, Book 9, Hadith 1896 (DE)
Arabic reference (DE): Book 9, Hadith 1971 (DE)